Low-pressure boiler



Sept. 24, 1929. R J. COLLlNs r 1,729,567l

' Low PRESSURE BOILER Filed July 20, 192e 2 sheets-sheet 1 4 wl l 39 a 55 f f i l /M 15 /f/f F g` o @\/9 Q/ 4 l L f 1 y l I 0 30 l N j l 5 i r Y T' ffx l 2 Sheets-Sheet 2 m n MU R. J. COLLINS l LOW PRESSURE BOILER Filed Judy 20, 1926 Sept. 24, 1929.

Patented Sept. 24, 1929 PATENT Gli'FlCE RICHARD J. CLLNS, OF PAVJTUCKET, RHODE ILAND LOW-PRESSURE BOLER Application filed July 20, 192.

rllhis invention relates to a boilerl and particularly to a construction of the low pressure type.

1t is aimed to generally improve articles of this character and part'cularly to provide a means wherein the heat Will be spread to all parts of the boiler so that maximum heat may bc obtained from the outside row of coils and a construction in Which a small steam chamber suilices and very little water reserve required.

Another object is to provide novel construction wherein steam may be injected into the boiler in order to blow soot or dirt from the coils.

Addition al objects and advantages will become apparent from a consideration of the description following taken in connection with accon'ipanying drawings illustrating an perative embodiment.

ln said drawings:

Figure 1 is a front elevation of the device;

Figure 2 is a vertical sectional view through the device taken on the line 2 2 of Figure 1;

Figure 3 is a transverse sectional view taken on the line SW3 of Figure 1; and

Figure is a transverse sectional view taken on the line Ll-al of Figure 1 and particularly showing the steam inlet mechanism in connection with the baille.

Referring specifically to the drawings. the boiler is primi-wily of the low pressure type and consists of an outer shell 10 and an inner shell 12 therein of less diameter and less height so as to provide a Water space 13 adapted to contain Water up to the level 14, which Water is supplied as through a pipe 15 under appropriate control. From the boiler, steam passes through an outlet pipe 1G to radiators or source of use. A return pipe 17 is connected with the pipe 16 and to the space 13 adjacent the base thereof. A Water gage is shown at 18 and the shell also has a plurality of try cocks 19 communicating with the Water space and loca-ted adjacent the top.

The boiler is supported on a suitable cast-- ing at 19, carrying a grate 20 so that a furnace is provided as at 21 at 'the base of the Serial No. 123,686.

boiler. A furnace doorway 22 is provided through the boiler, being normally closed by a door at 23. The ashpit is formed in the casing 19 as at 2l and its door and doorway are shown at 25.

Any suitable number of vertical heating coil` 27 are vertically disposed Within the shell 1l and over the furnace7 such coils preferably being arranged concentrically about the ve" cal axis of the shell and having inlet and outlet terminals as at 28 and 29 ettending through the shell 12 and communicating Wit-h the Water space 13. Such coils are pie`.rably made of copper tubing of approximately one-sixteenth of an inch thick so that the heat may readily penetrate the same to the Water. Attention is called to the factl that t ie terminals 28 are not soldered or welded to the. shell 12 but on the contrary are expanded tightly in a leak-proof manner in place. Inspection openings are provided in the outer shell 10 opposite the terminals 2S as at 29, which are normally closed by plugs 30, removable to permit access to the said terminals as when repairing and installing new coils. Clean-out openings covered by plugs at 81 are also provided at various locations about the boiler.

Rising centrally from the shell 12 is a flue member 33, which extends above the section or shell 10 and such extension constituting a nipple to u'f'hich the discharge flue pipeml may be connected. A suitable damper is positioned in the flue pipe 35. Y

Attention is called to the Jfact that all joints are preferably Welded since the boiler is of the low pressure type and built for instance for a pressure of fifteen pounds. llilhen the boiler is built for higher pressure7 the parts must be riveted and stay-bolted, according to the pressure required.

Disposed centrally within the section 12 relatively close to the flue member 33 is a cone-shaped deiiector 37, for heat, serving to spread it with respect to the various heating coils to obtain maximum use of the heat. Such spreader or dellector 37 is of greater diameter than the flue member 33 and of slightly less diameter than the shell 12. Such spreader is mounted in any suitable manner as by means of brackets or arms 38 fastened about and to the interior of the shell l2.

An upstanding pipe 39 is disposed central* ly of the flue member 33 and has bearing at its lower end on the apex of the deflector 37,

such pipe extending exteriorly of the flue pipe 35 and above the same having a suitable operating crank or handle as at 40. Said pipe is journaled in the flue section 35 andl in a spider or bearing 4l within the flue inember 33. Said pipe has a nozzle terminal 42 which extends across the conical upper sur face of the spreader or deflector 37 and is then hooked downwardly and inwardly at i-3 over the lower edge thereof. The said pipe 39 has a suitable connection as at til whereby itinay be fastened to a source of supply of steam or the like, which is useful in cleaning the boiler, particularly about the heating coils. As the pipe 39 is journaled or rotatably mounted, manipulation of the crank l0 will serve to rotate the arm l2 so that the nozzle lI3 will direct the steam or other cleaning medium to all of the heatingl coils for maximum cleaning.

Various changes may be resorted to provided they fall within the spirit and scope of the invention.

I claim as my invention A boiler of the class described having inner and outer vertically arranged shells to provide the water space, heating means for the boiler within the inner shell, heating coils arranged within the inner shell around the vertical wall thereof and communicating with the water space, an outlet flue member extending through the Crowns of said shells, a cone-shaped heat spreader within said inner shell and adjacent said member and having its edges spaced from the vertical wall of the inner shell to direct heated products toward the wall of the inner shell, an inlet pipe for a cleaning medium journaled in said member, said pipe having bearing at the apex of the spreader, and anozzle extending from adjacent the bearing point and radially of the spreader and thence under the saine and terminatingl in position to direct its discharge longitudinally of said coils. In testimony whereof I aihx my signature.

his RICHARD J. COLLINS.

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